LET'S RESIN Polyurethane Casting Resin

1. Introduction

This manual provides instructions for the safe and effective use of LET'S RESIN Polyurethane Casting Resin. This two-part resin system is designed for rapid curing, producing durable, opaque white castings with low viscosity and minimal odor. It is suitable for creating prototype models, sculptures, figurines, and other resin crafts.

2. Safety Information

WARNING: This resin contains chemicals that may cause skin irritation and permanent eye damage. Always follow safety precautions.

• Always wear protective gloves, a mask, and safety goggles before use.
• Work in a well-ventilated space to minimize exposure to fumes.
• Avoid direct contact with skin and eyes. If contact occurs, rinse immediately with water and seek medical attention if irritation persists.
• Keep containers tightly sealed when not in use.
• Maintain a working temperature under 25°C (77°F) to ensure optimal curing and reduce potential for overheating.
• Avoid direct contact of the resin with water, as water can cause the resin to expand or bubble.

3. Package Contents

• 30oz Part A Polyurethane Resin
• 30oz Part B Polyurethane Resin

Note: Due to differing densities, the bottles may appear to have different capacities, but both Part A and Part B contain no less than 30oz.

4. Product Features

• Rapid Curing: Cures from liquid to durable plastic within 10 minutes, with a 2-minute working time.
• Ultra-Low Odor & Easy Mixing: Features super low viscosity and low odor, with a simple 1:1 mix ratio by volume or weight.
• Self-Degassing: Designed to produce bubble-free castings without the need for a vacuum chamber or pressure pot.
• Versatile Application: Ideal for pouring into rubber molds to create accurate casts for prototype models, sculptures, figurines, and special effects props.
• Colorable & Machinable: Once fully cured, castings are lightweight, tough, machinable, paintable, waterproof, and resistant to mild solvents.

5. Setup and Preparation

1. Ensure your workspace is clean, dry, and well-ventilated.
2. Gather all necessary tools, including measuring cups, mixing sticks, molds, and safety gear.
3. Maintain a working temperature for the resin and workspace under 25°C (77°F) for optimal results.
4. Prepare your molds by ensuring they are clean and dry.

6. Operating Instructions

6.1 Mixing the Resin

1. Pour an equal amount of Part A and Part B resin into two separate measuring cups.
2. Combine both parts into a larger, clean mixing vessel.
3. Stir the mixture thoroughly for approximately 15 seconds. Ensure the mixture is completely uniform, with no visible streaks or unmixed areas.

Figure 1: Measuring equal parts of resin A and B.

6.2 Pouring and Curing

1. Immediately after mixing, slowly pour the resin mixture into your prepared mold. The resin has a working time of approximately 2 minutes.
2. For larger projects or deep pours, pour the resin in layers. Allow each layer to cure and stop producing heat before pouring the next layer.
3. The resin will begin to cure and turn opaque white within 10 minutes. Avoid touching the mold during the curing process.

Figure 2: Slowly pouring the mixed resin into a mold.

Figure 3: The resin curing and turning opaque white.

6.3 Demolding

Once the resin is fully cured (typically within 10 minutes), carefully demold your creation. The cured resin will be tough and rigid.

Figure 4: Demolding a cured resin piece from a silicone mold.

7. Applications

LET'S RESIN Polyurethane Casting Resin is highly versatile and can be used for a variety of creative projects:

• Creating prototype models and figurines.
• Casting sculptures and special effects props.
• Producing decorative jewelry components.
• Crafting intricate pieces that require fine detail capture.

Figure 5: Examples of multi-use resin crafts.

8. Care and Maintenance

• Store the resin in its original sealed containers in a cool, dry place away from direct sunlight.
• The resin has a shelf life of 1 year.
• Once cured, resin pieces can be cleaned with mild soap and water. Avoid harsh chemicals.

9. Troubleshooting

• Resin not curing or remaining tacky: Ensure the 1:1 mixing ratio by volume or weight is precise. Mix thoroughly for the recommended time (at least 15 seconds). Inaccurate ratios or insufficient mixing are common causes of curing issues.
• Bubbles in cured resin: While this resin is designed to be self-degassing, ensure slow pouring to minimize air entrapment. Working in a warmer environment (within the recommended temperature range) can also help reduce viscosity and allow bubbles to rise. Some users find a quick pass with a heat gun or torch helpful, but use with caution.
• Overheating during curing: For large or deep molds, pour the resin in multiple thin layers, allowing each layer to cool and partially cure before adding the next. This prevents excessive heat buildup.
• Resin turning yellow prematurely: Ensure proper storage conditions. Exposure to UV light and high temperatures can accelerate yellowing over time.

10. Specifications

11. Warranty and Support

If the product is damaged during transportation, for example, in case of leakage or partial loss, please contact LET'S RESIN customer support immediately. We are committed to resolving any issues promptly.

For further assistance or inquiries, please visit the official LET'S RESIN store or contact customer service through your purchase platform.